Sandpapering-machine.



No. 812,119. PATENTED FEB. 6, 1906. A. B. BENSON.

SANDPAPERING MACHINE.l

APPLIUATION FILED Nov.2e,19o4.

attenua? t, TED STATES PATENT" onirica.

sANADPAPERlNe-MACYHINE.

Specification of Letters Patent.

Patented Feb. 6, 1906.

Applioation'ed November 29,1904. Serial No. 284,801.

To all whom it may concern,.-

Be it known that I, ARTHUR B, DENsoN, a

citizen of the United States, residing at Beloit, in the county of Rock and State of Wisconsin, have invented new 'and useful lmprovements in Sandpapering-Machin`es, of which the following 1s a specification.

. This invention relates to sandpaperingmachines adapted for operation by air or other fluid under pressure, and has for its objects to produce a comparatively simpleinexpensive device of this character in which the fluid .will be admitted alternatelyand successively to. the operating members or pistons for moving the sandpapering devices alternatel and in reverse' directions, one wherein t e machine will be under constant and ready control of the o erator, and one in which the dust\ produce Lincident to the action of the smoothing and polishing de-A vices will be expelled from beneath the latter by the iluidexhausted from the machine.

With these and other objects in view the invention comprises the novel features of construction and combination of fully hereinafter described.

parts more In the accompanying drawings, Figure 1 is l a side elevation, partly in sectlon, of a machine embodying the invention.' Fig. 2 is a horizontal sectional plan, the section being taken on the line 2 2, Fig. 1. Fig. 3 is a detail front elevation of the machine.' Fig. 4

is a detail section taken on the line 4 4 of Fig. 3.

Referring to the drawings, 1 and 2 designate a pair of parallel cylinders appropri-l ately spaced transversely to produce between them a valve-chamber 3, the cylinders being connected by a bridge-piece or frame .4, which spans the space between the cylinders atv apoint above the chamber 3, and from which bridge-piece there arises a vertical tuy bular member or post 5, having an internal valve-chamber 6 and a passage or duct 7 leading from ksaid valve-chamber to'the air chamber or chest 3.

- n Arranged for Vrve'ciprocation in the cylinders 1 rand 2 are pistons 8 and 9, carried by rods 10, pivotally connected at their outer ends with a connecting-arm or. cross-head 11, in turn pivoted for oscillationnpon a iixed pintle or axle 12, arising vertically. from a fixed portionof the frame of the machine, there being carried bythe cross-head a central extension or enlargement'lS, provided with a curved Vguide-slot orjcamway 14, adapted to receive an antifriction-roller 15, journaled for rotation upon a pintle 16 atthe outer end of a reciprocatory valve-stem 17, carryin at vits inner end a valve 18, arranged for sli g movement in tli'e chest 3.

The cylinders' 1 and 2 communicate withY the chest 3 through the medium of inletports 19 and exhaust-ports '20, whilewithin the valve 18 isan inclosed chamber or space 21, adapted' for communication with the cylinders 1 and 2 through the medium of .ports 22, which register alternately and successively with the ports 19, this chamber being also in communication with the duct or passagel 7 through the medium of a port, (not shown,) While leading from the chest 3 at a point adjacent its inner end is an exhaust passage or duct 23, communicating with a hollow tubular web v24 at a point between the ends of the latter. Thev web 24, which extends longitudinally and centrally of the machine immediately beneath the chest 3, is

provided at suitably-spaced intervals with oppositely-extending lateral discharge openings or ports 25 for a purpose which will hereinafter appear, the post 12 being formed upon and fixedly carried by the tubular web 14 at a point adjacent the rear end of the machine.

The machine is equipped with a pair of rec iprocatory polishing devices or blocks 26,v

arranged, respectively, beneath the cylinders 1 and 2 and connected, by means of posts 27, with the rear ends of the piston-rods 10 these posts subserving the further function of pivotally connecting the rods with the crosshead 11, while the blocks are also connected at a point adjacent their forward ends with the cylinders by means of a rod 28, carried by hangers-29 and extended through guideways v or slots 30, provided in the blocks, these slots being in turn extended longitudinally of the blocks to permit free reciprocation of the latter upon the supporting member or rod 28. Each block has its lower active face covered by a sheet of sandpaper, emery-cloth', or other appropriate grinding or polishing material 31, secured in place at its opposite ends by clamps 32 33, it being obvious that under this arrangement the sheet of abrasive material may be readily removed to permit application to the blocks of material of varying degrees of coarseness or abrasiveness.

' Arranged in the valve-chamber 6 Within the vertical post 5 is a valve 34', adapted for closing the passage 7, this valve being car- IOO IIO

rie/d by a stem 35, acted upon by a spring 36 for normally pressing the valve to closed position. The valve may be moved to open position by means of an actuating member or 5 lever 37, pivotally engaged at one end With the valve-stem, this lever bein in turn'pivoted between its ends to a tubu ar handle 38,

i ing Cbeen covered with the appropriate material 31, the machine is seated' in position on the surface to be treated and the valve 34 opened by manipulating the actuating member or lever 37. The air or fluid under pressure thus finds its Way to the chamber 21 Within the lvalve 18 and from the latter, through the ports 19 and 22,'to the cylinders `l and 2 for reciprocating the pistons in the latter. As the pistons are reciprocated a corresponding motion will be communicated to the blocks 26, owing to their connection With the pistons, While at the same time the cam member 13, carried by the cross-head 11,Will act through the medium of its cam-slot 14 and the antifriction-roller for reciprocating the valve 18, thus to bring the ports 22 at opposite sides of the latter alternately into register with the ports 19, thereby stroking the: pistons alternately, as Will be readily understood. During the movement of ,the valve the exhaust-ports in the respective cylinders Will be successively uncovered at proper intervals, or, that is, during the instroke of the pistons 8 and 9, for exhausting the dead air from the cylinders, this air passing off through the duct 23 into the tubular Web 24, from Which it escapes through the lateral discharge-openings 25. As the exhaust-air is forced from the openings 25 it serves to blow the dust and other accumulations from beneath the active faces of the polishing devices 26, thereby preventing clogging of the abrasive material 31 and serving to maintain the' surface acted upon in proper condition for responding to the action of the abrasive material.

The motion of the polishing devices may be discontinued at any time and instantaneously by releasin the memberA 37, thereby fpermitting the va ve 34 to close and cut off the supply of fluid to the machine.

From the foregoing it is apparent that I produce a simple device which in practice will efliciently perform its functions to the attainment of the ends in vieW, it being underjsiano tons, and a tubular member disposed be-L tween the polishing devices and having discharge-ports directed to the latter, said member being in communication With the cylinders and adapted to receive the exhaust from the latter.

2. In a device of the class described, a pair of cylinders, pistons movable therein, polishing devices connected to and for movement with the respective pistons, means controlled by the movement of the pistons for admitting a iiuid under pressure alternately to the cylinders, and a tubular exhaust member communicating with the cylinders and extended between the polishing devices, said memberI having discharge-ports for directing the exhaust fluid toward the polishing devices.

3. In a device of the class described, a pairn of reversely-movable polishing devices, operating members connected therewith, a tubular member between the polishing devices and having discharge-ports directed toward the latter, and means for admitting fluid to and for actuating the operating members, the fiuid being adapted to exhaust through the tubular member for preventing `accumula tions beneath the polishing devices.

4. In a device of the class described, a reciprocatory polishing device, a tubular member sustained adjacent the side thereof and provided with exhaust-ports directed toward the device, an operating member connected With said device, and means for admitting fluid under pressure to the operating member, and a tubular member for actuating the polishing device and preventing accumulations therebeneath.

5. lIn a device -of the class described, a movable polishing member, means for operating the same, a tubular member disposed and sustained at one side of the polishing device and having ports directed toward the latter, and means for admitting fluid under pressure through the member to prevent accumulations beneath the'polishing device.

In testimony whereof I affix my signature in presence of tWo Witnesses.

ARTHUR B, DENSON. Witnesses:

A. B. LYNN, J. A. LOVE.

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